A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Determination of diffusion coefficient of chloride in concrete: an electrochemical impedance spectroscopic approach
Abstract For predicting the service life of concrete structures in marine environment, diffusion of chloride (D) is an important parameter. Electro-migration tests and ponding tests are two techniques conventionally adopted, however they are destructive in nature. EIS (Electrochemical impedance spectroscopy) being non-destructive appears a promising technique to arrive at ‘$ D_{R} $’ (D from EIS) in situ in structures. The $ D_{R} $ of ordinary Portland cement concrete (OPC) was compared with that of Portland pozzolana cement concrete (PPC). The effect of curing on $ D_{R} $ was analyzed. The splash zone condition was created by subjecting the specimens to alternate wetting and drying cycles. At the end of 28 days of curing, the $ D_{R} $ of PPC concrete is only 66.7% of that obtained in OPC concrete. A linear correlation was established between $ D_{R} $ and the porosity of the $ concrete_{.} $ Due to pozzolanic reaction, the rate of pore refinement is faster in PPC concrete compared to OPC concrete. In M25-PPC concrete at the end of 28 days of curing, the pore size is decreased to 14.6% of that obtained at the end of 3 days of curing. The reduction of pore size by densification of pore structure due to pozzolanic reaction reduces the $ D_{R} $ value in PPC concrete. In 30 MPa concrete the $ D_{R} $ under wet cycle is 3 times higher than in dry cycle, which implied that corrosion is initiated 3 times faster in concrete exposed to the splash zone condition.
Determination of diffusion coefficient of chloride in concrete: an electrochemical impedance spectroscopic approach
Abstract For predicting the service life of concrete structures in marine environment, diffusion of chloride (D) is an important parameter. Electro-migration tests and ponding tests are two techniques conventionally adopted, however they are destructive in nature. EIS (Electrochemical impedance spectroscopy) being non-destructive appears a promising technique to arrive at ‘$ D_{R} $’ (D from EIS) in situ in structures. The $ D_{R} $ of ordinary Portland cement concrete (OPC) was compared with that of Portland pozzolana cement concrete (PPC). The effect of curing on $ D_{R} $ was analyzed. The splash zone condition was created by subjecting the specimens to alternate wetting and drying cycles. At the end of 28 days of curing, the $ D_{R} $ of PPC concrete is only 66.7% of that obtained in OPC concrete. A linear correlation was established between $ D_{R} $ and the porosity of the $ concrete_{.} $ Due to pozzolanic reaction, the rate of pore refinement is faster in PPC concrete compared to OPC concrete. In M25-PPC concrete at the end of 28 days of curing, the pore size is decreased to 14.6% of that obtained at the end of 3 days of curing. The reduction of pore size by densification of pore structure due to pozzolanic reaction reduces the $ D_{R} $ value in PPC concrete. In 30 MPa concrete the $ D_{R} $ under wet cycle is 3 times higher than in dry cycle, which implied that corrosion is initiated 3 times faster in concrete exposed to the splash zone condition.
Determination of diffusion coefficient of chloride in concrete: an electrochemical impedance spectroscopic approach
Vedalakshmi, R. (author) / Devi, R. Renugha (author) / Emmanuel, Bosco (author) / Palaniswamy, N. (author)
2007
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2008
Determination of diffusion coefficient of chloride in concrete using Warburg diffusion coefficient
| British Library Online Contents | 2009